Grinding-mill



y UNITED STATES PATENT OFFICE.

JoHNBEALL, or DEcA'rUE, ILLINOIS.

GRlNDlN'G-MILL.

SPECIFICATION forming part ""of Letters Patent No.274,703, dated. March 27, 1883.

Application filed Decemberl, 1882. (No model.)

To all whom it may concern: I

Be it known that I, JOHN BEALL, of' Decatur, of the county of Macon and State of Illinois, have invented certain new and useful Improvements iu Grinding-Mills, of which the following is aspecification.

My invention relates to cylinders for grinding-mills; and it consists in a pair of rings having their circumferential surfaces provided with aseries otcuttingprominences resembling those of arasp or tile, said rings beingattached to a cylinder the ends of which are provided with deep concavities to receive the nuts and ends of the bolts that are used `to eiiect the attachment.

The object of my invention is to produce a grinding-cylinder that will operate eftectually at a low rate of speed, and in which the vcutting or grinding surfaces may be readily 4detached and sharpened or replaced with new ones.

In the drawings accompanying and forming a are the' rasp-rings. c is the cylinder. b are the bolts that secure the resp-rings to the cylinder. d is the shaft of the cylinder. e is a feedroller provided with shaft h and gear-wheelf. g is a gear-wheel on the shaft of the cylinder. m is a concave surface located under the cylinder, and supported and adj usted at o 0 in any ordinary or suitable manner. n is the discharge-opening. pis the hopper7 provided with slide-valve q, and o' r is acasing for the grinding devices. Y

Resp-rings a are placed on the cylinder and secured by bolts b bythe nuts of which lie in the concave ends of the cylinder. When the cutting-edges of the resp-rings become dulled said rings may be disconnected from the cylinder (by removing bolts b b) and recut or replaced by new rings.

Lprefer to operate my cylinder in combination with the casing and feed-roller herein set forth; but

What I claim as new, and desire to secure by Letters Patent, is-

The cylinder or roller for grinding-mills, composed of the resp-rings d, cylinder c, having concavee'nds, and securing-bolts b b, as and for the purpose set forth.

JOHN BEALL.

Attest ISAAC D.,WALKER, L. P. GRAHAM. 

